User's Manual Part 2

T
2
CAS / Part No. 9000000
SYSTEM DESCRIPTION AND INSTALLATION MANUAL
34-43-20
15 Feb 2003
Use or disclosure of information on this page is subject to the restrictions in the proprietary notice of this document.
4--41
Table 4--4. XS--950 Data Link Transponder Interface Description (cont)
Connector Pin
Designation
Functional Description
P1C--6 FAN +28 Vdc OUTPUT: (+)
The 28 Vdc version of the transponder can control an externally mounted +28 Vdc fan to
provide cooling air for the transponder. The Fan +28 Vdc output (P1C--6) should be
connected to the positive input of the fan, and the Fan Return (NO) Output (P1C--9)
should be connected to the negative input of the fan. The output has the capability to
drive a fan that draws up to 200 mA of current. The fan is turned on when the internal
transponder temperature rises above 30 degrees centigrade. In the 115 Vac version of
the transponder, the outputs are not used.
P1C--7 XPDR 115 Vac RETURN: (C)
See pin P1C--1.
P1C--8 SIGNAL GROUND INPUT:
Connect to Aircraft Signal Ground.
P1C--9 F AN RETURN (NO): (--)
See pin P1C--6.
P1C--10 XPDR +28 Vdc INPUT POWER: (H)
This pin along with the +28 Vdc RETURN line (P1C--3) provide the 28 Vdc power
requirements for the transponder.
NOTE: Only --55XXX thru --99XXX transponders accept +28 Vdc input power. If the
+28 Vdc version is used, the power should be connected through an 8 amp
circuit breaker, and the pins for the 115 Vac input (P1C--1 and P1C--7) should
be left unconnected.
P1C--11 CHASSIS GROUND INPUT:
Connect to aircraft frame.
P1C--12,
P1C--13
MUTUAL SUPPRESSION BUS INPUT/OUTPUT:
L--Band suppression coax must be RG--142 or equivalent coaxial cable. P1C--12 and
P1C--13 are connected internally. Connection to only one pin is required.
The Interface descriptions that follow are for the 53--pin ARINC 615 Portable Data Loader connector
J1 mounted on the front panel of the transponder. These descriptions are used to make up the
cable that is used to interface between the transponder and the ARINC 615 Data Loader or a
RS--232 PC Serial Port.
J1--1, 2 XPDR ARINC 429 PDL BUS INPUT: (J1--1 [A], J1--2 [B])
This differential pair input is a high speed ARINC 429 bus (100k bits/second nominal) is
used to input data from the data loader to the transponder . The standards for this
interface are defined in ARINC 615 “Airborne Computer High Speed Data Loader”.
These pins should be connected to pins 1 and 2 of the PDL cable interface.
J1--5 INPUT BUS SHIELD:
The shields from the input bus (J1--1, 2) should be connected to this pin.